Grade 9 · From USB to Field System: ESP32 water quality

Run a controlled water test

Follow the student handout to build, test and document this stage of the water-quality system.

Prepared lesson material. Start this task when your teacher introduces it; it is not currently assigned homework.

For this lesson

3 pages · Use the handout for the complete instructions, examples and response spaces.

Read the handout text online

For diagrams, visual examples and the full layout, open the handout above.

Lesson 11: Designing a Controlled Water Test

Planning and data collection sheet

Grade 9 MYP Design | From USB to Field System

Name: __________________

Class / team: __________________

Date: __________________

Today’s goals • Write a testable question. • Control sample volume, probe depth, time, and cleaning. • Collect repeated measurements.

Research question:

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Prediction and scientific reason:

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Variable type	What it is in our test	How it will be measured or controlled
Independent
Dependent: temperature
Dependent: conductivity
Dependent: turbidity
Controlled variables

Label sample cup and data file.

Use the same sample volume.

Rinse the appropriate probes with clean water.

Place probes at the same depth and position.

Wait the same settling time.

Record the same number of readings at the same interval.

Remove probes, rinse, and prepare the next sample.

Add or revise steps to match your exact test:

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☐ Sample labels match file names.

☐ Probe depth was consistent.

☐ Waiting time was consistent.

☐ Probes were rinsed between samples.

☐ Unexpected events were recorded rather than hidden.

Identify at least three sources of error and how you reduced them.

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